Dikshit Sawhney (DS)        858-231-2939 (M)               dsawhney001@gmail.com

 

Software Architect with extensive experience in system architecture design and protocol software development for Wireless and Wireline Network Infrastructure – LTE, IMS, UMTS (3G), GSM/GPRS, SS7, VoIP

 

Professional Summary

·   Excellent knowledge of LTE network architectures, 3GPP call flows and protocol software for Mobile Core (CN) and Radio Access Networks (RAN) with focus on Small Cells/eNodeB and Evolved Packet Core (EPC)

·   Good understanding of SDN/NFV concepts and cloud computing environments for next generation communications networks – cRAN, vEPC etc.

·   Hands-on experience with systems integration and end-to-end testing of LTE networks including network-in-a-box applications

·   Well-versed with software architecture design and optimization for multi-core multi-threaded computing environments

·   Rich experience in software development lifecycle processes (SDLC), project management, pre-sales, professional services, customer facing skills, vendor management and working with offshore development teams

 

Skills

Technology

o LTE, UMTS (WCDMA), VoIP/VoLTE, SS7, SDN/NFV, EPC (MME, SGW/PGW), Small cells, GWs, SGSN, GGSN, Trillium protocol stacks, ATCA, x86, Packet Processing, ARM processors, multi-core/multi-threaded applications

Telecom Protocols

o Wireless: S1-AP, NAS, eGTP/GTP, eMM/eSM, RANAP, GMM/SM, Diameter, RRC, RLC, MAC, PDCP

o IMS/VoIP: SIP, H.248, TCP/UDP/IP, SS7/SIGTRAN: MAP, ISUP, TCAP, MTP3/M3UA, Networking: TCP/IP

Programming Languages / OS

o C, Object oriented design concepts, Linux, Solaris, RTOS, Unix Shell scripting

Tools

o Gcc/Gdb, IBM Clearcase/Clearquest, Project Management and Microsoft Office Tools

o Network Emulators for eNodeB, EPC, UE simulation tools, Commercial 3G/LTE UEs (modems), Protocol analysis using Wireshark, Tcpdump

 

Work Experience

Radisys, San Diego, CA - July 2011 to April 2016

·   Systems Architect, Staff

o   Lead software architect for Radisys LTE Small cell, Core Network and Trillium branded telecom protocol stack solutions. Responsible for software architecture design, development and end-to-end integration testing of wireless (cellular) network infrastructure software solutions e.g., small cells, MME, SGW/PGW, HeNB-GW etc. Strong knowledge of small cell architecture, RAN stack (L2/L3) porting & testing on 3^rd party SoC/PHY  and 3GPP call flows for Access/Non-Access Stratum protocols (RRC, RLC/MAC, NAS, S1-AP/GTP, Diameter).

 

o In-depth understanding of LTE network infrastructure ecosystem and vendors – Small cell SoCs (Intel, Broadcom, Octasic), EPC platforms (Intel x86/COTS, Packet Processors – Netlogic XLP, Cavium Octeon). Engaged in multiple RAN and EPC stack integration activities on SoC and x86 platforms. Well versed with fast path architectures (DPDK) for scalable and high performance data plane nodes – SGW/PGW, SGSN/GGSN

 

o Core Member of Technical Staff responsible for detailed software architecture design of RAN solutions for next generation cellular networks – Small cells and Centralized (cloud) RAN applications. Extensive experience with software development on multi-core, multi-threaded compute environments, Linux OS e.g., architecting and optimizing L2+ RAN protocol stacks on SoC (ARM CPU), Intel x86 (COTS) for commercial small cells, cloud based RAN deployments, and network-in-a-box type applications etc.

o Key member of LTE EPC architecture transformation for a data center as per ON.Lab (ONOS) M-CORD project initiative. Responsible for defining split control/data plane architecture for Radisys PGW in line with SDN/NFV model and integration with 3^rd party RAN and vEPC solutions to build an end-to-end LTE network hosted on Open Compute/COTS platforms. The solution was successfully demonstrated at ONS Summit in March 2016 and resulted in company becoming an official systems integrator for M-CORD.

 

o Led integration and testing of Radisys RAN, and EPC software solutions on a small cell SoC + ComE module (small form factor x86 board) to build a ruggedized LTE network-in-a-box solution. Extensive experience in IOT testing with 3^rd party RAN and Core Network solutions e.g., Polaris, Quortus EPC, OpenIMS, and commercial LTE UEs (modems).

 

o Architect for professional services engagements involving design and development of custom technology solutions around eNodeB, EPC and protocol software e.g., private, public safety LTE networks, next generation cloud based networks, traffic offload GW, Mobile Edge Compute, LTE UE test & measurement solutions, Small cell GWs, Satellite RAN etc. Helped drive significant growth in professional services business and enter new solution markets.

 

o Experience with technical marketing and thought leadership activities - product roadmap evolution, webinars, trade show and customer demonstrations etc.

 

Continuous Computing, San Diego, CA - Feb 2003 to June 2011

·   Program Manager/Project Manager, Principal Engineer

o   Technical Lead/Project Manager of team responsible for development of Trillium® branded protocol software for UMTS (3G) Core Network and Radio Network elements like SGSN/GGSN, RNC, HLR and telecom protocols such as GPRS Tunneling Protocol (GTP), RANAP, RNSAP, GMM/SM, MAP. Responsibilities included technical leadership, requirements analysis, high level design, managing project schedules and pre/post-sales support.

 

o Project Lead for Trillium+ integrated SS7 card solution consisting of Trillium GSM-MAP, CAP, ISUP protocol stacks pre-integrated on 3^rd party SS7 line cards from Adax and Interphase. Project involved integration of L2/L3 SS7 stack from Trillium with 3^rd party L1 and sample application layer development. This initiative led company to enter the integrated SS7 card market and reduce the time-to-market for OEM customers.

 

o Principal software engineer responsible for Wireless/VoIP protocol stack development, reference application design and integration testing on CCPU’s 40G ATCA hardware platform utilizing compute, switch and network processor blades. Helped establish CCPU as a major player in wireless network infrastructure solutions space with pre-integrated software solutions on ATCA platform.

 

o Lead software engineer of an all-IP 3G network “demo” showcasing Trillium wireless protocol stacks for RNC, SGSN & GGSN integrated on CCPU’s ATCA hardware platform. The “demo” was shown at the company booth during MWC 2004 in Cannes, France. The project involved design & implementation of various RAN and CN simulators consisting of GTP-c, GTP-u and GMM/SM, RANAP and MAP/TCAP protocol stacks for RNC/SGSN/GGSN/HLR etc.

 

Trillium Digital Systems, an Intel Company, Los Angeles, CA - Dec. 1999 to Jan 2003

·   Senior Network Software Engineer

o   Responsible for design and implementation of Wireless & VoIP software stacks and application design for GPRS/3G network elements like HLR, SGSN, RNC etc. Key focus areas included development of GTP and SIP telecom protocols.

 

o Design and development of control (GPRS Mobility/Session Management) and user plane (GTP-u relay) applications for a prototype SGSN project utilizing Trillium protocol stacks and integration on Intel IA (x86) platform.

 

o Application development and protocol stack integration activities for TEMs as part of numerous professional services engagements. One such project was a SIP – MEGACO VoIP protocol inter-working application for a tier 1 customer in Japan and for which a patent application was also filed.

 

Center for Development of Telematics (C-DOT), New Delhi, India - Aug 1996 to Nov 1999

·   Senior Research Engineer

o   Design and implementation of the Mobility Management (MM) sub-system of the C-DOT’s GSM MSC project. The project involved software design, implementation and integration on a class 5 switch.

 

o Development and testing of various call processing features like distinctive ringing, caller ID, call forwarding, call waiting etc. in the C-DOT's Digital Switching System (DSS).

 

Awards & Recognitions

·   Awarded Certificate of Appreciation at Continuous Computing (CCPU) for leading a key customer project

·   Awarded Group Award for outstanding performance at C-DOT

 

Education

·   Bachelor of Engineering (1992-96) with Honors in Computer Science from Punjab Engineering College, Chandigarh, India.